J.J. Callan

3.0k total citations
82 papers, 2.5k citations indexed

About

J.J. Callan is a scholar working on Animal Science and Zoology, Agronomy and Crop Science and Small Animals. According to data from OpenAlex, J.J. Callan has authored 82 papers receiving a total of 2.5k indexed citations (citations by other indexed papers that have themselves been cited), including 57 papers in Animal Science and Zoology, 40 papers in Agronomy and Crop Science and 20 papers in Small Animals. Recurrent topics in J.J. Callan's work include Animal Nutrition and Physiology (56 papers), Ruminant Nutrition and Digestive Physiology (36 papers) and Meat and Animal Product Quality (23 papers). J.J. Callan is often cited by papers focused on Animal Nutrition and Physiology (56 papers), Ruminant Nutrition and Digestive Physiology (36 papers) and Meat and Animal Product Quality (23 papers). J.J. Callan collaborates with scholars based in Ireland, United Kingdom and Italy. J.J. Callan's co-authors include J.V. O’Doherty, Torres Sweeney, F.P. O’Mara, M.B. Lynch, K.M. Pierce, D.K. Lovett, John T. O’Sullivan, T.M. Boland, B. Flynn and C. J. O’Shea and has published in prestigious journals such as Bioresource Technology, Journal of Dairy Science and Agriculture Ecosystems & Environment.

In The Last Decade

J.J. Callan

81 papers receiving 2.3k citations

Peers

Countries citing papers authored by J.J. Callan

Since Specialization

Citations

This map shows the geographic impact of J.J. Callan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by J.J. Callan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J.J. Callan more than expected).

Fields of papers citing papers by J.J. Callan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by J.J. Callan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by J.J. Callan. The network helps show where J.J. Callan may publish in the future.

Co-authorship network of co-authors of J.J. Callan

This figure shows the co-authorship network connecting the top 25 collaborators of J.J. Callan. A scholar is included among the top collaborators of J.J. Callan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with J.J. Callan. J.J. Callan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Effect of crude protein and phosphorus level on growth performance, bone mineralisation and phosphorus, calcium and nitrogen utilisation in grower-finisher pigs 2011 ·Archives of Animal Nutrition ·P.F. Varley, (unknown), J.J. Callan, J.V. O’Doherty	10
2	Effect of phosphorus level and phytase inclusion on the performance, bone mineral concentration, apparent nutrient digestibility, and on mineral and nitrogen utilisation in finisher pigs 2010 ·Irish Journal of Agricultural and Food Research ·(unknown), J.J. Callan, J.V. O’Doherty	6
3	A comparison between Holstein-Friesian and Jersey dairy cows and their F1 hybrid on milk fatty acid composition under grazing conditions 2010 ·Journal of Dairy Science ·(unknown), F. Buckley, R. Prendiville, John J. Murphy, J.J. Callan, D.A. Kenny	85
4	Effect of dietary mineral level and inulin inclusion on phosphorus, calcium and nitrogen utilisation, intestinal microflora and bone development 2010 ·Journal of the Science of Food and Agriculture ·P.F. Varley, (unknown), J.J. Callan, J.V. O’Doherty	17
5	Effect of dl-malic acid supplementation on feed intake, methane emissions, and performance of lactating dairy cows at pasture 2009 ·Journal of Dairy Science ·P.A. Foley, D.A. Kenny, D.K. Lovett, J.J. Callan, T.M. Boland, F.P. O’Mara	26
6	Fatty acid intake and milk fatty acid composition of Holstein dairy cows under different grazing strategies: Herbage mass and daily herbage allowance 2009 ·Journal of Dairy Science ·(unknown), M. O’Donovan, John J. Murphy, M. McEvoy, J.J. Callan, T.M. Boland, D.A. Kenny	13
7	Effect of -glucans contained in barley- and oat-based diets and exogenous enzyme supplementation on gastrointestinal fermentation of finisher pigs and subsequent manure odor and ammonia emissions 2009 ·Journal of Animal Science ·C. J. O’Shea, Torres Sweeney, M.B. Lynch, (unknown), J.J. Callan, J.V. O’Doherty	38
8	Effect of crude protein concentration and sugar-beet pulp on nutrient digestibility, nitrogen excretion, intestinal fermentation and manure ammonia and odour emissions from finisher pigs 2008 ·animal ·M.B. Lynch, C. J. O’Shea, Torres Sweeney, J.J. Callan, J.V. O’Doherty	41
9	The effects of seaweed extract inclusion on gut morphology, selected intestinal microbiota, nutrient digestibility, volatile fatty acid concentrations and the immune status of the weaned pig 2008 ·animal ·P. Reilly, J.V. O’Doherty, K.M. Pierce, J.J. Callan, John T. O’Sullivan, Torres Sweeney	118
10	The effects of cobalt and iodine supplementation of the pregnant ewe diet on immunoglobulin G, vitamin E, T3 and T4 levels in the progeny 2008 ·animal ·T.M. Boland, (unknown), Torres Sweeney, J.J. Callan, Alan W. Baird, Simon Keely, T.F. Crosby	23
11	Effect of refined coconut oil or copra meal on methane output and on intake and performance of beef heifers1 2006 ·Journal of Animal Science ·Emily Jordan, D.K. Lovett, Frank J. Monahan, J.J. Callan, B. Flynn, F.P. O’Mara	89
12	The application of low crude protein wheat-soyabean diets to growing and finishing pigs. 2. The effects on nutrient digestibility, nitrogen excretion, faecal volatile fatty acid concentration and ammonia emission from boars. 2005 ·Irish Journal of Agricultural and Food Research ·(unknown), J.J. Callan, Richard Henry, J.V. O’Doherty	25
13	The effect of dietary garlic and rosemary on grower-finisher pig performance and sensory characteristics of pork 2005 ·Irish Journal of Agricultural and Food Research ·(unknown), Frank J. Monahan, J.J. Callan, J.V. O’Doherty	60
14	The application of low crude protein wheat-soyabean diets to growing and finishing pigs 1. The effect on the growth performance and carcass characteristics of boars and gilts 2005 ·Irish Journal of Agricultural and Food Research ·(unknown), J.J. Callan, Richard Henry, J.V. O’Doherty	5
15	The effects of mineral supplementation to ewes in late pregnancy on Immunoglobulin G absorption by their lambs 2004 ·Proceedings of the British Society of Animal Science ·T.M. Boland, P. O. Brophy, J.J. Callan, P.J. Quinn, P. Nowakowski, T.F. Crosby	2
16	The effects of a mineral supplementation when offered to pregnant ewes for the final 6, 4 or 2 weeks pre-partum on Immunoglobulin (IgG) absorption in their offspring 2004 ·Proceedings of the British Society of Animal Science ·M. J. Guinan, Gunyon M. Harrison, P. O. Brophy, J.J. Callan, P.J. Quinn, T.M. Boland, P. Nowakowski, T.F. Crosby	2
17	Supplementary Concentrate Type Affects Nitrogen Excretion of Grazing Dairy Cows 2004 ·Journal of Dairy Science ·F.J. Mulligan, P. Dillon, J.J. Callan, M. Rath, F.P. O’Mara	75
18	The effects of offering mineral blocks to ewes pre-mating and in late pregnancy on block intake, pregnant ewe performance and immunoglobulin status of the progeny 2004 ·Animal Science ·T.F. Crosby, T.M. Boland, P. O. Brophy, P.J. Quinn, J.J. Callan, (unknown)	21
19	The interaction between lactofeed level and soya-bean meal on growth performance of weanling pigs 2004 ·Animal Science ·J.V. O’Doherty, (unknown), J.J. Callan, (unknown)	19
20	Effect of two microbial phytases on the performance and nutrient retention on grower-finisher pigs fed barley-maize-soyabean meal-based diets 2003 ·Irish Journal of Agricultural and Food Research ·Sheila M. Brady, J.J. Callan, David J. Neep, Mary M. McGrane, J.V. O’Doherty	20

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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